▎ 摘　　要

NOVELTY - Graphene oxide fluorescent material (I) is new. USE - (I) is useful as fluorescent probe for detecting ferric ion or as adsorbent for ferric ion (claimed) and water treatment. ADVANTAGE - (I): used as probe to ensure detection limit of ferric ion as low as 5.76x 10-2 mu mol/l; and has excellent interference resistance and capacity of ferric ion as adsorbent with greater than 50 mg/g. DETAILED DESCRIPTION - Graphene oxide fluorescent material of formula (I) is new. INDEPENDENT CLAIMS are also included for: (1) preparation of (I); and (2) use of (I) for detecting ferric ion or as adsorbent for ferric ion.